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Ch.2 - Atoms & Elements
Chapter 2, Problem 104

Fill in the blanks to complete the table. Symbol Z A Number of p_x001E_ Number of e_x001D_ Number of n Charge Si 14 ____ ____ 14 14 ____ S2- ____ 32 ____ ____ ____ 2- Cu2+ ____ ____ ____ ____ 34 2+ ____ 15 ____ ____ 15 16 ____

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Step 1: Understand the relationship between atomic number (Z), mass number (A), number of protons (p), electrons (e), and neutrons (n). The atomic number (Z) is the number of protons, and the mass number (A) is the sum of protons and neutrons.
Step 2: For Si (Silicon), Z = 14, and the number of protons = 14. Since the atom is neutral, the number of electrons = 14. The number of neutrons can be found using A = Z + n, where n is the number of neutrons.
Step 3: For S2- (Sulfide ion), A = 32. The charge indicates it has gained 2 electrons, so the number of electrons = Z + 2. Use the mass number to find the number of neutrons: n = A - Z.
Step 4: For Cu2+ (Copper ion), the charge indicates it has lost 2 electrons. The number of electrons = Z - 2. The number of neutrons is given as 34, so use n = A - Z to find the mass number.
Step 5: For the element with Z = 15, the number of protons = 15, and the number of electrons = 15 (since it is neutral). The number of neutrons is given as 16, so use A = Z + n to find the mass number.
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